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张槐听得一愣一愣的，忽然笑道：那这小事该让谁来管？郑氏道：去。SummarySo now, originally one object was responsible for instantiating all specific classes, now through some changes to the PizzaStore, a group of subclasses are responsible for instantiating specific classes: the subclasses of FactoryPizzaStore are responsible for implementing CreatePizza;女孩含着笑，含着泪，讲述着自己的故事。好像是我手机，别管它……吕馨呢哝细语道。SYN flooding attacks can attack with fewer packets than ordinary brute-force DoS attacks that only send a large number of packets to the target network. However, this requires some understanding of the server's operating system, such as how much backlog queue space it allocates and how long it will keep the TCB in the SYN-RECIEVED state before timeout and discarding the TCB. For example, an attacker can send a certain number of SYN packets that are exactly the size of the backlog queue, and their cycles are just the time when the TCB is recycled, thus making the server permanently unavailable.